AN-300
ARINC 429 Devices Lightning Protection
RTCA/DO-160G, Section 22 Level 3
November 2014
INTRODUCTION
Part Number
This Application Note provides recommended practices for
protection against lightning induced transient susceptibility
for Holt’s family of ARINC 429 Devices. These
recommended circuit diagrams were tested according to
RTCA/DO-160G, Section 22 Level 3 Pin Injection Test
Waveform Set A (3 & 4), Set B (3 & 5A), Set Z (3 & 5B). Pin
surge levels for Level 3 are listed in a matrix of four
separate pin injection threats as shown below:
Level
Waveforms
3
3
4
5A
5B
VOC/ISC
VOC/ISC
VOC/ISC
VOC/ISC
600/24
300/60
300/300
300/300
RTCA/DO-160G Table 22-2 Pin Injection Level 3
The circuit diagram provided in Figure 1 with R1 (Table 1),
Figure 2 and Figure 4 (Table 2) achieved RTCA/DO-160G
category designation A3XXXX, B3XXXX and Z3XXXX
.
RECEIVER INPUT PROTECTION
Holt has three categories of lightning protection for ARINC
inputs for their products. The first are products which
require no external components and have “Built-In” Level 3
protection identified in Table 1. The second are products
that have a “Lightning” option and are designed to be used
with an external resistor, R1, in series with each ARINC
input as shown in Figure 1. All “Lightning” option parts must
have the resistor specified in Table 1 in series with each
ARINC input for proper ARINC signal level detection.
Typical Holt ARINC Receive Channel
Vcc
(A)
R1
GND
Vcc
(B)
R1
GND
R1 Required external, 0.25W series
resistor (See Table 1)
(A) ARINC (A) Input from Holt
Devices from Table 1
HI-3282-10
HI-3582-10
HI-3582A-15
HI-3583-10
HI-3583A-15
HI-3584-10
HI-3584A-15
HI-3585 (RIN-40 only)
HI-3586 (RIN-40 only)
HI-3588 (RIN-40 only)
HI-3593 (RIN-40 only)
HI-3596-40
HI-3597-40
HI-3598 (RIN-40 only)
HI-3599-40
HI-3717 (RIN-40 only)
HI-3718 (RIN-40 only)
HI-8282A-10
HI-8444-10
HI-8445-10
HI-8450
HI-8451
HI-8454
HI-8455
HI-8448-10
HI-8475
HI-8476
HI-8581-10
HI-8582-10
HI-8583-10
HI-8584-10
HI-8588-10
HI-8589-10
HI-8591-40
HI-8599-10
HI-8684-10
HI-8685-10
HI-8686 (RIN-10 only)
Required External
Resistor (R1) W
15K
15K
15K
15K
15K
15K
15K
40K
40K
40K
40K
40K
40K
40K
40K
40K
40K
15K
15K
15K
Built-In
Built-In
Built-In
Built-In
15K
13K
13K
15K
15K
15K
15K
10K
15K
40K
15K
15K
15K
15K
Table 1- Line Receiver “Built-In” &
“Lightning” Options Resistor Values
(B) ARINC (B) Input from Holt
Devices from Table 1
Figure 1 - Line Receiver Input Protection for
“Lightning” Option Products
(AN-300 Rev. H)
HOLT INTEGRATED CIRCUITS
www.holtic.com
11/14
AN-300
The third category of ARINC 429 line receivers inputs do
not have the “Lightning” option. These rely on a zener type
protective diode, D1, with ratings as shown in Figure 2 to
provide lightning protection to RTCA/DO-160G, Section 22
Level 3 Pin Injection Test Waveform Set A (3 & 4), Set B
(3 & 5A), Set Z (3 & 5B). Some series resistance, R2, may
also be desirable, but must be kept to less than 500W so as
not to effect the ratio of the internal resistor network used to
detect valid ARINC levels. Care must also be taken when
selecting protection diodes to ensure that the diode
capacitance in conjunction with the external series
resistance does not cause excessive distortion of the input
waveforms, particularly when operating at high speed
(100 Kbps).
Typical Holt
ARINC Line Driver
(1)
(2)
D2
D4
37.5W
(A)
D4
(B)
37.5W
D2
(A) ARINC (A) Output for Holt Devices
from Table 2
(B) ARINC (B) Output for Holt Devices
from Table 2
(1)
D4 15V Zener diode (1N4744A-T)
(May not be required - See Table 2)
(1) Connect to circuit ground
D2 5.0V bidirectional protective diode,
(2) Connect to V+
1500W rating (Littlefuse SMCJ5.0CA)
Typical Holt ARINC Receive Channel
(1)
Figure 3 - Line Driver Protection with Built-in
37.5W Series Resistors (Non-“Lightning” Option)
Vcc
D1
(A)
R2
GND
Vcc
(B)
R2
D1
(1)
D1 85V bidirectional protective diode,
1500W rating (Littlefuse SMCJ85CA )
GND
(A) ARINC (A) Input for Holt
devices
The third type of Holt ARINC 429 line driver has some or all of
the internal series resistance removed as shown in Figure 4.
This allows the user to add external series resistors, R4 & R5,
between the device and the ARINC bus to provide lightning
protection to RTCA DO-160G, Pin Injection Level 3,
waveform Set A, B & Z. The external resistor R5 limits the
current in the bidirectional protective diode, D3. A 15V zener
diode, D4, may also be required for full protection. Refer to
Table 2 for the correct external resistor values to correctly
match the impedance of the ARINC bus and if zener diode,
D4, is required.
R2 External 470W 0.25W 5% metal film resistor (B) ARINC (B) Input for Holt
devices
(Panasonic ERJ8GEYJ471V) (optional)
Typical Holt
ARINC Line Driver
(1) Connect to circuit ground
Figure 2 - Line Receiver Input Protection for
Non- “Lightning” Option Products
(A)
D4
There are three types of Holt differential line drivers. Table 2
lists the lightning protection configuration suggested for
each part number with an internal line driver.
The second type is also designed for direct drive of the
ARINC 429 bus, but they rely on an external protective type
diode, D2, with ratings as shown in Figure 3 and, if required,
a 15V zener diode, D4, for lightning protection to RTCA DO160G, Pin Injection Level 3, waveform Set A only. Refer to
Table 2 to determine which part numbers require zener
diode, D4. Since any series resistance will cause a
mismatch to the ARINC bus, the addition of external
resistors is not recommended with this type of line driver.
D3
D4
R3
DIFFERENTIAL LINE DRIVER PROTECTION
The first type is “Built-In” Level 3 lightning protection and
requires no additional components for direct drive of the
ARINC 429 bus. These products have a nominal 37.5W
internal resistor in series with each ARINC output to match
the 75W characteristic impedance of the ARINC bus
achieving full Level 3 protection for waveform set A, B & Z.
(1)
(2)
R3
R5
R4
R5
R4
(B)
D3
(A) ARINC (A) Output for Holt Devices
from Table 2
(B) ARINC (B) Output for Holt Devices
from Table 2
R3 Built-in series resistor (See Table 2)
R4 External 0.25W series resistor
(See Table 2)
R5 External 1W wire-wound resistor
(See Table 2)
(1)
D3 5V bidirectional protective diode,
600W rating (Littlefuse SMBJ5.0CA)
D4 15V Zener diode (1N4744A-T)
(May not be required - See Table 2)
(1) Connect to circuit ground
(2) Connect to V+
Figure 4 - Line Driver Protection Using External
Series Resistors (“Lightning” Option)
HOLT INTEGRATED CIRCUITS
2
AN-300
Schematic
Figure
Part Number
No.
HI-3182
3
HI-3183
4
HI-3184
3
HI-3185
3
HI-3186
4
HI-3188
4
HI-3189
4
HI-3582
3
HI-3582A
3
HI-3583
4
HI-3583A
4
HI-3585 (A/BOUT27)
4
3
IH-3585 (A/BOUT37)
HI-3587 (A/BOUT27)
4
HI-3587 (A/BOUT37)
3
HI-3593 (TXA/BOUT)
3
HI-3593 (AMPA/B)
4
HI-3717TXOUTBA/BB(HA/HB)
3
HI-3717 OUTBA/BB(HA/HB)
4
HI-3718TXOUTBA/BB(HA/HB)
3
HI-3718 OUTBA/BB(HA/HB)
4
HI-8470
Built-In
HI-8570
3
HI-8571
4
HI-8281
3
HI-8382
3
HI-8383
4
HI-8581
3
HI-8582
3
HI-8583
4
HI-8585
3
HI-8586
4
HI-8592 (TXA/BOUT)
3
HI-8592 (AMPA/B)
4
HI-8593
3
HI-8594
4
HI-8596 (TXA/BOUT)
3
HI-8596 (AMPA/B)
4
HI-8597
Built-In
HI-8589
4
HI-8599
4
HI-8784
3
HI-8785
4
HI-8787
3
HI-8788
4
Diode
15V Zener
(D4)
Not Required
Not Required
Not Required
Not Required
Not Required
Not Required
Not Required
Required
Not Required
Required
Not Required
Not Required
Not Required
Not Required
Not Required
Not Required
Not Required
Not Required
Not Required
Not Required
Not Required
Not Required
Not Required
Not Required
Not Required
Not Required
Not Required
Required
Required
Required
Not Required
Not Required
Not Required
Not Required
Not Required
Not Required
Not Required
Not Required
Not Required
Required
Required
Required
Required
Required
Required
Built-in
(R3)
37.5
13
37.5
37.5
0
0
0
37.5
37.5
10
10
27.5
37.5
27.5
37.5
37.5
5
37.5
5
37.5
5
37.5
37.5
27.5
37.5
37.5
13.0
37.5
37.5
10
37.5
2
37.5
5
37.5
5
37.5
5
37.5
10
10
37.5
10
37.5
10
External
(R4)
0
20.5
0
0
33.5
33.5
33.5
0
0
23.5
23.5
2
0
2
0
0
28.5
0
28.5
0
28.5
0
0
6
0
0
20.5
0
0
23.5
0
31.5
0
28.5
0
28.5
0
28.5
0
23.5
23.5
0
23.5
0
23.5
Resistors
External
(R5)
0
4
0
0
4
4
4
0
0
4
4
8
0
8
0
0
4
0
4
0
4
0
0
4
0
0
4
0
0
4
0
4
0
4
0
4
0
4
0
4
4
0
4
0
4
Table 2 - Line Driver Lightning Protection Component Values
HOLT INTEGRATED CIRCUITS
3
Total
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
37.5
Units
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
AN-300
REVISION HISTORY
Document
AN-300
Rev.
D
E
F
G
H
Date
Description of Change
08/07/09
12/14/10
02/07/11
11/05/14
Major update to add new part numbers and update protection requirements.
Added HI-8592, HI-8593, HI-8594 & HI-8596 to Table 2.
Added HI-3586, HI-3593, HI-3596 & HI-3597 to Table 1 & HI-3593 to Table 2.
Added HI-371x, HI-845x, HI-847x, HI-8597, to Table 1 & 2 and text.
Removed ARINC Data Bus reference in Figure 1-4.
Removed Protection Background, Wiring Consideration, Protective Devices, Verification
Damage vs. Functional Upset Text and Figure 5.
11/20/14 Changed Table 1 HI-8475/76 from not required to 13K.
HOLT INTEGRATED CIRCUITS
4